I had a local (and highly recommended) gunsmith install a side/slide scope mount on my mak90. This gun has been trouble free and accurate/fun gun; but I wanted to try seeing how far out I could go.
So he installed the side mount and claimed it was all centerlined with the bore.
When I got home, the actual mount was skewed, in that the rear of the rail was on the left side of bore centerline, while the front of the rail was on the right.
The result is I can zero a scope at a fixed distance, but at any other distance it's off by feet -- iow: if not "at the distance zero'd" I do not only have to aim for elevation/bullet drop; but also horizontal for the distance. "aim about 2' away from the target" knid of thing.
The gunsmith insists that it was centered; but there's no way it is.
I ordered a different brand mount to see if the mount was in error -- but it shows the exact same issue. This is not that it's just off set from center line, it's skewed across it.
If it were "just a scope" I could get rings to offset to 'hack a solution' and get it aligned to the bore; but I am using an eotech...
Has anyone experienced this? Any thoughts on correcting it? (other than replacing the rifle) The only thing I thought of was somehow shimming the the side-mount so that the resulting scope rail would be aligned with the bore.
I don't think it's a "stamped" or "mak90" issue -- as I've seen both (non mak90 stamped & mak90) with side rails and they were spot on and they didn't do anything special.
Just for fun, I did some quick calculations:
My math is probably flawed.... but:
(This would be for a scopy center lined to the mount vs straight out the barrel.)